Read “The Demon in the Freezer” by Richard Preston (the guy who wrote “The Hot Zone”). It’s about smallpox and the threat of bio-terrorism post-9/11. It goes in detail about the smallpox eradication effort and what was done with the few remaining samples (basically nothing at the time of its writing). He also interviewed a bio-weapons expert who told him the ideal attack would be done with a combination of smallpox and anthrax, spread on a fine powder in the wind, which was then demonstrated as possible. That book will leave a nice warm fuzzy in your belly /s.
I read an excerpted version of that when it was released. Absolutely terrifying.
Thanks, click click, just ordered it !